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A Hybrid Formation Absorption Compensation Method

A compensation method and stratigraphic technology, applied in the field of geophysical exploration, can solve the problems that the efficiency cannot meet the production needs and the stability cannot be effectively guaranteed.

Active Publication Date: 2011-12-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] There are two big problems with the current Q absorption compensation method: stability and efficiency
[0004] The Q absorption compensation method in the time domain is realized by cascading inverse Q filters. For relatively long seismic traces, the stability of this method cannot be effectively guaranteed, and the method has great limitations.
[0005] The Q-absorption compensation method in the frequency domain is realized by wave field continuation, and the amplitude and dispersion compensation is realized by introducing the formation absorption factor into the continuation operator. This method needs to be calculated one by one. For large three-dimensional For pre-stack seismic data, its efficiency cannot meet production needs

Method used

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  • A Hybrid Formation Absorption Compensation Method
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  • A Hybrid Formation Absorption Compensation Method

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Embodiment Construction

[0042] specific implementation plan

[0043] The data used in the embodiment of the present invention is two-dimensional survey line data actually collected from the field. The basic situation of the data is: the data track length is 7000 milliseconds, the sampling interval is 2 milliseconds, and the whole survey line has a total of 794 shots, each shot 594 Dao, the work is divided into 4 layers, 0-110 milliseconds is the first layer, the quality factor is 130, 110-2700 milliseconds is the second layer, the quality factor is 200, 2700-3400 milliseconds is the third layer, the quality factor is 300 , 3400-7000 milliseconds is the fourth layer, and the quality factor is 450.

[0044] The specific implementation steps are:

[0045] 1) Artificially stimulate seismic waves at different positions along the direction of the survey line on the surface, place seismic wave receiver strings at the receiving position to receive seismic wave field signals, and then transmit them to the re...

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Abstract

The invention relates to a mixed stratigraphic absorption compensation method in seismic data processing in the geophysical exploration technology. The method comprises the following steps: transforming a seismic wave field signal which is received by a current channel from a time domain to a frequency domain, mapping from a frequency grid in which the seismic wave field signal is located to a new frequency grid, performing frequency-dependent proportional zoom, transforming to the time domain for getting the wave field signal with the seismic wave frequency dispersion effect caused by corrected formation absorption and adopting a time domain gain limit wave filter to perform cyclic convolution for getting the new wave field signal. In the method, the fast frequency dispersion correction is performed in the frequency domain, the stable amplitude compensation is performed in the time domain, the stability and the high efficiency during the absorption compensation process are ensured and the resolution of seismic data and the accuracy of interpretation of a fine bed are improved.

Description

technical field [0001] The invention relates to geophysical prospecting technology, which is a method for compensating stratum absorption mixed in seismic data processing. Background technique [0002] In the field of geophysical exploration, when the excited seismic wave propagates in the underground medium, the Q absorption effect of the formation can attenuate the energy of the seismic wave, and the higher the frequency, the faster the attenuation, resulting in the narrowing of the frequency band of the received seismic signal. At the same time, due to the seismic wave dispersion effect caused by absorption, the phase of the seismic wave is distorted, resulting in the ineffective matching of the seismic section and the logging data, and bringing inaccurate information to the interpreters. Therefore, compensating the absorption effect of the formation has great significance for improving the resolution of seismic data, the accuracy of interpretation of thin formations and ...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 王文闯李合群
Owner BC P INC CHINA NAT PETROLEUM CORP
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